A dado
or groove that's too deep can jeopardize the strength and
ruin the appearance of a joint. This handy gauge eliminates
these problems by providing accurate settings in an instant.

Just rest the gauge's feet on your router's base or your router
table insert and move the appropriate notch over the tip of
your bit to make your setting. Graduated in 1/16-inch increments
from 1/8-inch to 1-inch. Can also be used to set saw blade
depths up to 1-inch.